Immersion-heater.



E- I. OVINGTON.

IMMERSION, HEATER. APPLICATION FILED 13110.1, 1911v 1,1 17,950, PatntedNov. 17. 1914.

Invenimr; Edward elflringi/m} n f fly *5 UNITED STATES PATENT QFFTGE.

EDWARD J. GVINGTON, G35 LOS ANGELES,

CALIFORNIA, ASSIG-NOR, BY MESNE ASSIGN- MENTS, TO SIMPLEX ELECTRIC HEATING COMPANY, OF CAMBRIDGE. IYIASSAGHU" SETTS, A COE-PORATIQN OF MASSACHUSETTS.

TMMERSION-HEATER.

Specification of Letters Patent.

Patented Nov. 17, 1914.

do all whom it may concern Be it known that I, EDWARD J. Ovmoron, a citizen of the United States. residin f at Los Angeles, in the county of Los Angeles and State of California, have inventedtnew and useful Improvements in Immersionlleaters, of which the following is a specification.

This invention relates to immersion heaters, and more particularly to such heaters the heat units of which are electrically generated or supplied, heaters so organized being particularly adapted for immersion in water and other fluids for raising the temperature thereof.

This invention in its general aspects-constitutes a departure from or improvement with relation to the subject-matter covered by prior Letters Patent No. 994,188 issued to me June 6, 1911, for in electric heating unit; and the leading and more significant features of improvement entering into the present invention pertain tothc broad class of heating units as well as specifically to immersion heaters having means for electrically supplying heat units.

.iiccording to the present invention, I provide an insulating body Within which the electrical resistance ,element is disposed, such insulating body being in the main surrounded by a metallic closely-fitting shell, a stem projecting from the upper portion of the body, and a metallic cap fitting the lower portion. of the body and joined orscaled to the shell, preferably by a solder joint. In order to render the joint completely lirmid-proof, and in fact to inclose the entire insulating body and shell and cap in a liquid-proof sheath, 1 impose upon the shell and the cap, and the'join't between the shell and cap, a copper or other metal,- lic plating The flexibility of the copper plate compensates responsively for any expansion or contraction of the metallic shell and cap end the solder joint, if there be such, between the same, as under widely varying temperatures causing meltingof the solder; and if the oint tends to yawn or open, as after melting of the solder, it is effectually maintained liquid-proof by the copper plating over the same. This plating, due to its flexibility and ductility, com.- pensates as above stated for any disturbance of the joint and for any contraction and expansion incident thereto. All danger of short-circuiting or ground of the resistance element due to liquid conduction is therefore eliminated.

A principal feature and advantage of the invention will therefore be seen to consist in the provision of a heating unit inclosed first in a two-part metallic inher casing, and second in a single continuous outer metallic sheath positively preventing passage of liquid to the heating unit through the joint between the two parts of the inner casing, suchsheath being capable of expansion and contraction and of material stretching at such joint. Further more, I provide a superficial conformation of the entire body organized as above, which is predicated upon a transverse section of varying dimensions, as of oval or elliptical formation. The body may also be of increasing cross-sectional area, as from the top to the bottom thereof, preserving still the stated formation of such area. The conformation described provides for a relatively large surface in proportion to displacement, directly presented to the liquid within the smallest vessel within which the heater may be introduced, and consequently for a relatively great transmission of heat units to the liquid.

In addition to the above advantages, the conformation stated is, because of its unbroken and regular surface, more readily kept clean than are other forms such as fluted, \vavy 01' the like.

With the above and other objects in view, and the above and equivalent means and features entering into the embodiment thereof, the invention consists in the novel and useful provision, construction, formation, combination, association and relative orraiigement of parts, members and features, all as'hercinafter described, shown in the drawing, and finally pointed out in claims.

In the drawing: Figure-l is a side elevation of an immersion heater or heating unit organized in accordance with the invention; Fig. 2 is a transverse sectional View, taken upon the line 22, Figs. 3 and l; Fig.

dis a view similar to Fig. 1 of a modified form ofconstructiong" Fig. 4; is a'central vertical sectional view taken-through the 7 v1- lar is F g. 2-, at? a Jlill further mmlifie a nsfiruc'izion.

@errespsnding parts in all the daa'mte flay ihe reference chaiactez' .g with partlculamiy $0 the (l- CL .4 .stan" threughoui film mags? 'portzon 01- m is elliptical A as shown in 2, but,

In the 150m: B, the cress-sectienal m we the as m flae as shewn.

arm

31; Fig. 3, said czoss-ssctlomi azaa'vanas lifie em tmnsverse planes 0: *Lll heater file alimensimls m? such cz'css-sectwnai Jncataa'i cone.

ed i

w the llediers A. will; an upwslrly ext-sliding stem C tllmugll WZllfillfilQCfilifial conductovs are let? is the name? iahl-ough any suimbla insulntinnl anti is pro'vifiie 335ml from the geemetrlcgl fefmafiion 0': sup'rficial area 0% the heaters, the ccnstructiim 21ml erganizatiomof loofih forms A an E balzxg the same, I will only refer to ihe will: respect is the farm shown in Figs, 1 2, and 5, aml the m'ganizsitian therein' is as follows :-Tl1e heater has lwiy a 05: insulating ma'iiefiall within which.

is 01' clisposefi a resisfv'gnce slement b of any prefarre natural, "ti e particular qualltias aml. characf-eristics 0:? the insulating elemani; and tha resisisame element being no? csmcexneil. in tha pressngL-izwent-ixml The resistance elemeni. is electricfillyeennefitetl csncluc'bors c and d, "she Siam 3, im' supplying l ctrlcal energy. Suvmfiml ing the body a m' themajor portien tli z'enf, at the and tap parfi. way upwmfily @lmrefmm upon film Ste; C is 12, shell 6 fmmecl 0r spun upon ills b -ziy-a anal 'lns aly fitting the, same Formed 111ml m6; cavering ihe lower @1161 of the lowly a is a bag, F

the lower marginl pmrtisns of tlw she lapping ever the marginal ax isns of ma f and a 3mm, 9 being termed; l} mew-21 sash sve'rlapping pertiams in Fig; l, m 5 flag. @i a Shawn in fozmer ssnsisting DYEfQYElQEYQfi s, mf er: the equiv len'l; ap glied bslfiw-fim cap. z'ihe @Xl'rems lowas edge p0; 1011 of the shell is clasal}; en-

win e salcler of thejoinz, Eyeing 9116* mibl? spun, fpressgil Q1 beaten lawn up'en $aI1QG iOf OTm a'tllin feather eclga a extremizy 01": which anti the em films 0f the s msarginal pertim'xs 61 0? baten (lawn 11pm thin edge as s01 posed between the shell ail: extreme marginal artial: celved 2m anmz f shall 6 at in @verlap s menses. The metallic plaiin eluded uprszl and ever .311 w s I srvss to fjgrgoz gswmme'clmm "as? muci traction at ch 3 As ll'lllllfilly palms-5i 011%, a fsst by li-lae feregcing clescrip 0:1 cnnectinn with the accompany; it "will "be hailed that the copp r the ps'rtien thereof which mersecl, preventing leakage throw of the shell 6 m lhe sap f or the g m tween tl'u sax; e; anal 53121621113, shrislliag-e enlargement 01" she joint will. be late by the, flexible m1 ductile cup- 325? "plating. g

Furilzermova, an efieciive/ jfilil m m 1s formecl by thinning clown 2', terial 0f the shell in m an rfi'remely f edge which GV lllQS the sglier beabw efe, uikd overlapping portisns of ille shall and cap; or, as in Fig. 5, clirectly overlies T38 superficial conformaizicn the pmvicles i or-clisseminatima 0f larg n2 "oer of heat units through a gwla'ively la v'lume 0f l'lqulcl within l la'smallsfig. c0 miner which will receive ill? eficgz allay be varieel in slightly a? by the pmiisisn' nfftlle ccnfemlv cross-sec'ticnal area (lisclasecl in 2 and 3, i' laive E0 the ferm'll, which is Qfial 35 ellipfical'im cmss-sscticnal area, but ridrly of tagaefeal'anrl cflntralctad Mum-Man cmical conforrtien.

Z), resistanse elzls'lors c I 5003; heat unis L30 generamnsmltteai liquid surmvn Wailing: fnessiel 51pm unflplzigeil eiifiarloi" surfaie'nf illl heatfi:

10m cleslre izo be undersiwzl as limifly ing myself to the specific provision, construction, formation, combination, association and relative arrangement of parts, members and features shown and described; but reserve the right to vary the same. in adapting the improvements to varying conditions of use, without departing from the spirit of the invention and the terms of the following claims.

Having thus described my invention, I claim and desire to secure by Letters Patent:

1. An electrical heating unit of the character set forth, comprising an insulating body provided with'a resistance element, a shell and a cap upon and surrounding the body,.and a water tight connection of the cap and shell comprising a solder joint bec tween the shell and cap, and a copper plating over the joint.

2 An electrical heating lllllt- '0f the character set for h. comprising an insuIating body provided with a resistance \l hL a shell and a ca'p surrounding the body, there being a solder joint between the shell and the cap, and a marginal portion of the shell being relatively thin-edged at the solder joint overlapping said cap and a copper plating over the oint.

In testimony whereof, I have signed my name to this specification in the presenwo1 two subscribing witnesses.

EDWAR D J. ()YINGTON.

Witnesses C. P. Wt-worm, RAYMOND Ives llmmzsnnn. 

